Crusher-head for grinding-mills.



E. S. BLACK.

CRUSHER HEAD FOR GRINDING MILLS.

I Patented June 4, 1912.

APPLICATION FILED 00T. 28 1911.

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EDWARD S. BLACK, OF CHICAGO, ILLINOIS, ASSIGNOR TO EDGAR ALLEN AMERICAN MANGANESE STEEL COMPANY, OF AUGUSTA, MAINE, A CORPORATION F MAINE.

CRUSI-IER-HEAD FOR GRINDINGr-MILLS.

To all whom t may concern Be it known that I, EDWARD S. BLACK, a

of Illinois, have made and invented certain new and useful Improvements in Crusher- Heads for Grinding-Mills, of which the following is a specification.

My invention relates to crusher heads for grinding mills, the object thereof being to provide an improved head formed as a s ingle casting from a hard and tough material, such, for example, as manganese steel, the interior of said Crusher head being provided with cavities to lighten the weight thereof and reduce its cost, and also to provide for a uniform cross-section of metal to thereby avoid injury from shrinkage as the casting cools.

My improved Crusher head is designed with especial reference for use in gyratory crushing mills, although the features wherein my invention resides are equally applicable to Crusher heads designed for 4use in mills of other types. I

Vith the above and other objects in view, my invention consists in the improved Crusher head hereinafter described and claimed, and illustrated in the accompanying drawing, and in such variations and modifications thereof as will be obvious to those skilled in the art to which my invention relates.

In the drawing accompanying and forming a part of this application, Figure 1 is a view showing a section taken on a vertical plane of a portion of a crushing mill equipped with my improved Crusher head; Fig. 2 is a view showing a section taken upon a vertical central plane of the preferred form of my invention; Fig. 3 is a fragmentary view taken upon horizontal planes indicated by the line 3 3, Fig. 2, looking down Fig. 4 is a similar view taken upon planes indicated by the line 4.-4, Fig. 2, looking up; Fig. 5 is a view showing a section upon a vertical central plane of an alternative form of my improved Crusher head; and, Fig. 6 is a view showing a section upon a horizontal plane indicated by the line 6 6, Fig. 5.

Referring first to the form of my invention shown in Figs. 2, 3 and 4, the reference character 7 designates my improved crusher head as a whole, the same being commonly Specification of Letters Patent.

Application filed October 28, 1911.

Patented June 4, 1912. Serial No. 657,265.

7 is provided with a central bearing extending vertically therethrough in order that it may be secured to the driving shaft 8, and also with a plurality of internal cavities as shown at 10, these cavities extending from the internal bearing surface outward toward the periphery of the head, but terminating short of such periphery, the cavities being commonly formed by providing suitable cores about which the fluid metal flows as the head is cast, the openings 16 of the cavities preferably intersecting the surface of the bearing providedfor the shaft, as will be understood from Fig. 2. The cavities are also preferably placed in open communication with the atmosphere at the upper and lower ends of the head by means of passages 11, 12, the purpose of this feature being to permit of the free circulation of air through the same.

The cavities l0, in the form of my invention shown in Fig. 2, are in the form of longitudinally extending recesses opening into the bearing provided for the driving shaft, and do not communicate with one another. In the form of my invention shown in Fig. 5, however, the internal cavities designated by the reference character 13 extend circumferentially of the head, and communicate with one another by means of vertically extending passages 14, which passages extend through the upper and lower ends of the head and therefore communicate with the atmosphere, so that air may circulate therethrough and through the cavities 13. These cavities 13 also communicate with the bearing for the driving shaft by means of openings 15, the surface of the bearing for the shaft being' intersected by a number of holes in this form of my invention, whereas in the form shown in Fig. 2, the bearing surface is intersected 'by a plurality of longitudinally extending passages.

In either of t-he forms illustrated, it will be seen that the provision of cavities or recesses 10 or 13 materially lightens the head and reduces the amount of material therein; at the same time, the cavities in connection with the air passages referred to, provide an effective means for cooling the head as a whole, and prevent it from becoming distorted by heat, it being not uncommon 'in practice for Crusher heads of the type disclosed in this application to become highly heated, due to friction and work done in crushing. The form of crusher head disclosed also provides for an` approximately uniform cross-section of metal at all points, and therefore provides a head which is not liable to become distorted or broken by stresses due to cooling.

Having thus described and explained my invention I claim and desire to secure by Letters Patent:

1. A crusher head formed as a single integral casting and having a central bearing designed t'o receive a driving shaft, and a plurality of internal recesses or cavities; said recesses having longitudinally extending openings which intersect the bearing aforesaid and terminate short of the upper and lower ends of the head and said recesses being in communication with the surrounding atmosphere through passages formed in the head and extending through the upper and lower ends thereof.

2. A crusher head formed as a single integral casting and havinga central bearing designed to receive a driving shaft, and a plurality of internal recesses or cavities;

said recesses being in communication with the surrounding atmosphere through passages extending through the upper and lower ends of t-he head, andkin communication with the central bearing aforesaid through openings the length of which is less than the length of said-head. l

3. A crusher head formed asa single integral structure and having a central bearing surface designed to receive a driving shaft, and a plurality of recesses arranged one above the other and extending circumferentially about the bearing surface, and communicating therewith through a series of holes, said head having also a plurality of verticallyA extending passages intersecting said recesses or cavities and whereby they are placed in communication with one another, the upper and lower ends of said passages extending through the ends'of the heads whereby said recesses are placed in communication with the surrounding atmosphere.

Signed-at Chicago in the county of Cook and State of Illinois this 23 day of October A. D. 1911.

EDWARD s. BLACK.

Witnesses:

F. M. MILLER, EUGENE C. BONER.

Copies of this patent may be obtained for ve cents each, by addressing the, Commissioner of Patents,

Washington, D. G. 

